MBP display is showing a thin green line on left side of the screen

Hi All,
I have 15 inch Unibody MacBook Pro bought in late 2009. Specs are as below. Initially it was 4GB RAM. I upgraded it later to 8GB OWC RAM.
Model Name:          MacBook Pro
  Model Identifier:          MacBookPro5,3
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.8 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          6 MB
  Memory:          8 GB
  Bus Speed:          1.07 GHz
  Boot ROM Version:          MBP53.00AC.B03
  SMC Version (system):          1.48f2
NVIDIA GeForce 9400M:
  Chipset Model:          NVIDIA GeForce 9400M
  Type:          Display
  Bus:          PCI
  VRAM (Total):          256 MB
  Vendor:          NVIDIA (0x10de)
  Device ID:          0x0863
  Revision ID:          0x00b1
  ROM Revision:          3448
  gMux Version:          1.8.8
  Displays:
Color LCD:
  Resolution:          1440 x 900
  Depth:          32-Bit Color
  Core Image:          Hardware Accelerated
  Main Display:          Yes
  Mirror:          Off
  Online:          Yes
  Quartz Extreme:          Supported
  Built-In:          Yes
Display Connector:
  Status:          No Display Connected
I bought Lion from App Store recently and installed it successfully on my MBP. After few days when I left my machine running Lion from morning till evening I see a thin green line on the left side of the screen. I tried searching the web and tried few options like restarting the machine, resetting NVRAM and doing Apple hardware test (By pressing D while the machine boots). The Apple hardware test did not detect any problem. The green line still exists.
Please suggest me how to get rid of green line.

Hi Brent,
I took it to apple service center. They did some checks and found out that the display has gone bad and they replced it with new one.
Did you try connecting other display (may be Apple Display or Dell monitor) using an adapter?  In my case the Apple service center people tried doing it and the display was appearing just fine without any green line. So the fault was in my MBP display.

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